Speed-registering device



Nov. 26, 1929. c. ARNESEN 1,737,400

SPEED REGISTERING DEVICE Original Filed May 10, 1923 v5 Sheets-Sheet lNov; 26, 1929. c. ARNESEN SPEED REGISTERING DEVICE Orz'gginal Filed May10, 1923 5 Sheets-Sheet 2 Nv.26,'1929.' C. ARNESEN' 1,737,400

SPEED REGISTERING DEVICE original Filed May 1o, 1923 5 sheets-sheet 3Imam/Z5# Nov. 26, 1929.

c. ARNESEN 1,737,400

SPEED REGISTERINCT EVICE Original Filed May lO, 1925 5 Sheets-Sheet 4Nov. 2,6, 1929. c, ARNESEN 1,737,400

SPEED EEEISTERENG DEVICE original Filed May 1o-, 1923 5 sheets-sheet 5laented Nov. 26, i929 CHARLOTTE aniinsniv,

OFC

SEEIDYREGISTER- DEVICE Application led May 10, 1923, Serial No. 687,926.Renewed April 22, 1929.

In one aspect of the invention it has for its aim the provision of a4tering' device of anovel and advantageous chan actor ot the typeusually termed eters and commonly used for speed of travel of machinesor vehiclessuch as automobiles, aeroplane,V7 boats and the like.

Devices ot the type referred to now manufactured and sold7 employ in allcases of which l am aware, non-positive actuating forces such, 'forexample, as air under pressure and magnetism which are subject to changeunder varying weather conditi and otherwise are more or lessnndependable, where accurate results are necessary or oesirable.

The primary object oi my invention is to produce a speedometer of athoroughly practical character, in which speed registering or indicatingmechanism is arranged to be actuated through connection with a source ofpower which is positive in character.

In carrying out my invention as thus gen.- erally stated, l provide incombination with a constantly rotating element means for periodicallyconnecting an indicating device to said element for movement therebjg."7s mea-ns being under the control ot a governor mechanism oi"- anadvantageous character.

A further and important object of my invention is to provide a novel andadvantageous spring winding` means for speedometers and otherspring-actuated instrumenta having means operable to impart successivopower impulses each ot a deinite predetermined value to the winding ofthe actuating` spring.

till another object or my invention is to provide means which isoperable upon a stoppage of ne drive means and also in the event of areversal thereof as may occur when the vehicle to which it is applied ispronelled backwardly to elect a storage of power inthe spring, bypreventing a (le-energi ation of the same.

A general objectof'the invention and one ot substantial importance toprovide o. speed registering device tire chara 'ter rccrred to having aminimum number ol parts and capable of being manufactured on a veryeconomical basis.

i the accompanying drawings forming )art hereof, Figure l is ahorizontal sectional view through a device constructed accordance withmy invention.

ig. 2 is a vertical sectional view taken on li--e 2 2 of llig. l.

3 is a fragmentary elevational view partially diaorammatic in charactershow ing the device and its conn :tion with the front wheel ot a motorvehicle.

Fig. 4 is fragmentary vertical. sectional view taken in the plane ofline ll of Fig. 2.

Fig. 5 is a iront elevational view ot the device.

Fig. 6 is a fragmentary vertical sectional view taken substantially inthe plane oi line 6 6 of Fig. l and illustrating the operativeconnection between the governor element and the drive element.

wig. 7 is a similar view but with the parts in a somewhat differentposition.

Fig. is a fragmentary vertical sectional vi v taken in the plane of line8 8 of lf i g. 2. Fig. 9 is a fragmentary vertical sectional View takenin the plane of line 9 2) of F l. Fig. l0 is a central horizontalsectional view illustrating a modified form oi the .fle-

ll is a vertical sectional view taken in the plane of line ll-ll of Fig.lO.

l2 is a front elevational view ot this form of the device.

Fig. 13 is a fragmentary vertical sectional view taken substantially inthe plane oi: line ll ll of Fig. l0 and illustrating the operativeconnection between 'the drive element and the main element of thegovernor 1nechanisni in the modilied form shown in Figs. l0 and 1l.

Fig. 14 is a. fragmentary vertical sectional view taken substantially inthe plane of line M ME ot Fig. l1.

Fig. 15 is a horizontal sectional view ot still another embodiment.

Fig. 16 is a vertical sectional View taken in the plane ot line l5 l6oft Fig. l5.

Fig. 17 is an elevational view oi: the indi- -lUO cator dial employed inthis latter embodiment.

My improved speedometer comprises in its preferred form, an annular,cup-shaped casing 1 having a rear wall 1L and a front closing plate 16of glass or other transparent material. Said plate 16 is secured inposition upon the casing 1 in any suitable way, as by means of a clampcollar 15, which latter serves to hold in position a stationary dialplate 4. A central vertical partition 17 divides the casing into a rearcompartment 2 adapted to enclose the operating mechanism, and a forwardcompartment 5 adapted to contain a suitable odometer, not herein shown.

The rear wall of the casing has secured upon its inner side a base plate17a which has a rearwardly extending projection 6d providing a bearingfor a shaft 6 which is adapted to be connected with the element whosespeed is to be measured, as, for example, the front steering wheel 20(Fig. 3) of a motor vehicle. The connection may be of the usual typeenclosed within a conduit 20% 21 designates generally a coupling betweenthe shaft G and said flexible connection, one portion of the couplingbeing rigidly secured to the shaft 6 by .means of a pin 6C. The shaft 6projects into the rear compartment 2 (Figs. 1 and 8) and` has rigid withits forward end a pinion 18 arranged to mesh with a spur gear 19journaled in the lower end of an arm 24 which is mounted to swing upon ajournal provided by a bushing 6a (Fig. 8) on the forward end of theshaft 6.

Rigid with the gear 19 is a stud shaft 8a having a ratchet pinion 8 enits free end which meshes with a toothed disk 22 mounted in theembodiment shown in Figs. 1 to 9, concentrically of the casing upon asha ft 5. One arm 19a of a spring 19", coiled upon the bushing 6a, tendsto swing the arm 24 to move the pinion 8 into operative or drivingconnection with the disk 22.

Movement of the toothed disk 22 by the pinion 8 takes place against theaction of a helically coiled spring encircling the shaft 5 and havingone arm fastened to the disk and another arm 25a which is utilized foranother purpose hereinafter set forth. Reverse movement of the disk isnormally prevented by a holding pawl 22L mounted on a stem 12 eX-tending between the plate 17a and the dial plate 4. A spring alsomounted on this stem 12 has an arm 31c tending to more the holding pawlinto engagement with the disk 22. By a means to be later described, thepawl is periodically actuated to release the disk for movement by itsspring into its initial position determined by a stop pin 26a carried bythe plate 17 and adapted to be engaged by a stop shoulder 26b on thedisk 22. It is to be observed that the arrangement of the ratchet teethon the pinion 8 and disk 22 is such that a reverse rotation of thepinion will be ineffective to move the disk or injure it in any way; andit will also be noted that if for any reason the pinion should fail tobecome disengaged from the disk, no injury to the parts can result byreason of the limitation of the teeth on the disk to a portion only ofits periphery.

The shaft 5 is journaled at its rear end in the plate 17 a and also inthe central partition 17, the forward end of the shaft being eX- tendedthrough the dial plate 4 and carrying at its free end a pointer 4adapted to coact with a suitable scale upon the forward face of the dialplate. To accommodate the pointer 4, the dial plate 4 and the frontplate 16 are spaced apart by means of a suitable ring 15a.

It will be observed that by virtue of the movable mounting of theratchet pinion 8 upon the lower end of the arm 24, a disengagcableclutch connection is provided between the drive shaft and the indicatormeans. Fer controlling this clutch connection I provide a governingmeans including a shaft 11 arranged to be driven at a substantiallyconstant speed through an operative connection with the drive shaft 6.Said shaft 11 is mounted at its forward and rear ends respectively inthe partition plate 17 and the rear plate 17, and encircling said shaftis a coiled torsion spring 26, the outer end of which is made fast to atoothed wheel 30a through the medium of a pin 17b rigid with theI shaft11 (Fig. 4) and the other end of which is connected by a pin 35 with aratchet wheel 29 journaled upon a bushing 28 on the shaft 11. Thisspring is maiutained under substantially constant tension by a windingmechanism actuated from the drive shaft 6, whereby to cause the shaft torotate at a uniform speed under the control of an escapement mechanism(Fig. 2) of which the wheel 80 forms a part. Cooperating with this wheelis a holding device 27 comprising a rod 27" mounted on a shaft 27" andweighted at each end. ',hc rod 27a has a U-shaped holding device 27 Cadapted to engage with the toothed wheel 30a.

The means for energizing the spring 26 comprises in the present instancea pair of pawls 31 and 31 normally tending to move into operativeengagement with the ratchet wheel 29 under the influence of suitablecoiled springs 81h and 25 respectively. These pawls are mounted. uponthe free end of the shaft 6 eccentricallv thereof by means of a studscrew 32 (Figs. 2 and 8), the arrangement being such that the pawlsoperate successively in the rotation of the shaft to exert respectivelya pulling and pushing impulse upon the ratchet wheel 29. This rotationof the ratchet wheel causes it to rotate in a counter-clockwisedirection carryingr with it the inner end of the coiled spring to placeit under tension. Reverse rotation of the ratchet wheel is prevented bymeans of a holding pawl 29EL which is pivotally mounted upon the bushing6a at the forward end of the drive shaft 6, rearwardly of the arm 2d(Fig. 8), the other arm 19 of the coiled spring also mounted on thebushing 6 tending to hold this pawl at all times in engagement with theratchet wheel.

Means is provided for controlling the operation of the actuating pawls3l and 3F, and this means is also utilized for the purpose ofcontrolling the clutch connection between the drive shaft and theindicating means, as well as to effect a storage of power in the spring26 by preventing an unwinding thereof when the drive shaft comes to restor is reversely actuated. This means will now be described.

Mounted upon the shaft 6 through the medium of the bushing 6a (Fig. 8)is a pair of levers 33 and 29D the free ends of which extend to pointsbelow and above the shaft ll. The free ends of said levers 29h and areeach arranged to engage a laterally projecting lug` 33 near the free endof each of the pawls 3l or 31a, whereby to move said levers inwardlytoward the shaft ll tlnough the operation of the springs 3l" and 25W.

W'hen the levers are in their innermost positions F i0'. 7), the pawls8l and 3l are permitted to engage with the teeth of the ratchet wheel 29to effect the rotation of the latter; but at the end of each rewindingperiod, the levers 29b and 38 are simultaneously swun0` outwardly tocarry their respective pawls into inoperative position. This outwardmovement of the levers is effected by means of one or more cam fingerscarried by a dish 34 which is loosely mounted upon the shaft il butwhose movement is limited by a shoulder 85 (Fig. 2) provided by recessformed in the periphery of the t 4lr a n. adapted to be engaged by theforward end of the pin 35a (Fig. 1l). ln the present instance I providefour lever actuating; can), lingers Sel-1, spaced equidistantly aboutthe disk 34, and itl will be seen that in the rotation of the ratchetwheel 29, the cam lingers 3dr-"- are likewise rotated through theengagement of the pin 35 with the shoulder at one end of the ecess Insuch movement the two lingers which are diametrically disposed, engagesimultaneously with flansi'es 3"? carried upon the free ends of each orthe levers 25 and and move said levers and, through the lugs 33, thepawls 3l-31a outwardly out of engagement with the ratchet wheel.

In the movement of the cam 'lingers upon he flanges 3?', they engagewith inwardly projecting stop lugs 37 on each of the levers. These lugsserve to limit the movement of the cani fingers and h old the actuating`pawis in their outer positions until such fingers nr be released fromthe lugs 37a and car* o from engagement with the flanges 3i b y thecontinued rotation of the shaft ll under thc action of the spring 26.Such release is accomplished by means of a second set of lingers 10a,rigid with a dish l0 which fixed upon the shaft ll. rlhese iingers arealso adapted to engage with the flanges 37 but are inane suiiicientlylonger than the finger Sie, to move the levers far enough to permit thelingers 3l@ to escape past the stoo lugs W7 is the lingers l tt A U. iusride beneath the flanges 37, a laterally extending projection Ll0 on oneof said fingers engages one of the lingers 3d@ at 38 (Fig. 2) andpositively moves the dish 3d whereby to carry the lingers Sea out fromengagement with the .donnes while the ratchet wheel remains stationary.Such movement of tl e lingers on the disk 34 relative to the ratchet'wheel 29 is permitted by reason of the loose cou.- nection between thedisk Se and said wheel afforded by the pin 35 operating in the cutawayportion or recess in the periphery of the dish Obviously the levers 29hand 33 are now permitted to move inwardly to the position shown in Fig.l?, whereupon the actuating pawls 3l and 3l re-engage the ratchet whe-cl50 and in their reoiprocation effect a movement of the pin 35,increasing the tension upon the spring until the actuating pawls areagain rendered inoperative by the cani lingers on the dish 3d.

lt will be observed that by the provision of four lingers upon the disks3d and i0, actuating pawls 3l and 3l are moved into and out ofengagement with the ratchet wheel four times for each revolution of theratchet wheel, with the result that each operation the ctuating pawlsplaces a relatively sn all additional tension upon the spring. Uneadvantage in this arrangement is that the spring is maintained almostunder constant tension, being permitted to unwind only a quarter ofrevolution between each tensioning ol ration. A further advantage isthat the i nsion placed upon the spring at any tune never sufficientlygreat to cause more a slight frictional engagement between thc actuatingpawls and the ratchet wheel. rendering it less difiicult to disengagethe latter. lt will also be apparent, however, that the disengagement ofthe pawls is eifected by power derived from the drive shaft through thecam lingers on l .ne dis r 3f-fl, which latter actuated by the pin rigidwith the ratchet wheel the spring 26 being depended upon merely to carryt e lingers 10a, into cngageinentwiththe flanges 37 to release thelingers E34-f1 from the stop shoulders 37a.

lllhen the vehicle t which my speedometer is applied is brought to rest,it is essential, if the speedometer is to be capable of funetioning upona restar of the vehicle, that the spring 2G be prev d from unwindi isaccom- As above indicatec, dus result plished by the construction of thecontrol mechanism for the actuating pawls. Thus referring to Figs. 2 andil, it will be apparent that upon a stoppage of the drive shaft 6, theactuating pawls 31 and 31fL will have ceased to rotate the ratchet wheel29 whereby to move the pin 35 and thus effect a winding of the spring.Reverse rotation of the ratchet wheel 29 is prevented by t-he holdingpawl 29, so that the only other movement that can take place is themovement of the outer end of the spring secured by the pin 17b to thetoothed wheel 30a. Movement of the wheel 30, however, which it will beremembered is fast upon the shaft 11, will be limited by the operationof the finger 10 first into engagement with the finger 84, carrying thelatter with it until the pin 35a is engaged by the shoulder 35b formedby the right-hand end of the recess in the disk 34. The windingmechanism thus remains idle until the vehicle is again moved forwardly,when the actuating pawls resume their operation of energizing thespring.

To render itimpossible for the actuating pawls to be maintained in theirinoperative positions after the vehicle is brought to a stop, the lengthof the recess in the periphery of the disk 34 is made such as to permit`the spring to move the finger 34'L1 through the finger 10, out frombeneath the flange 37, should the finger 34 happen to stop immediatelyafter engaging with the flange 37 sufficiently to disengage theactuating pawls. On the other' hand, if the fingers 34a have not movedto disengage the actuating pawls, the construction of the ends of thefingers 10a is such as to engage with the free ends of the flanges 37 toprevent further movement of said fingers 10a. In other words, thearrangement is such that if the drive shaft should cease operation afterthe actuating pawls have been disengaged, then the spring is permittedto operate to effect the re-engagement of the pawls with the ratchetwheel; and if the pawls have not been moved into inoperative position bythe advance movement of the fingers 34, then the fingers 10a will act toprevent the disengagement of the pawls until the drive shaft is againset in motion.

It may here be observed that in the assembling of the part-s an initialtension is placed upon the spring 26 such that it will be capable ofmoving the fingers 10 relative to their flanges 37 to effect the releaseof the fingers 34a and the consequent re-engagement of the actuatingpawls with the ratchet wheel. The tension placed upon the spring by thewinding mechanism is in addition to this initial tension.

As already indicated, the clutch connection between the drive shaft andthe indicating means is arranged to be controlled also by the governingmeans which controls the winding of the spring. To this end I provideupon one of the controlling levers, herein the lever 33, a depending arm24 adapted to engage with the arm 24 carrying the ratchetpinion 8 toeffect the disengagement of said pinion upon the movement of said lever33 into inoperative position. This disengagement of the pinion 8 occursagainst the action of the spring 19a and in the movement of the lever 33by the fingers 10, which, it will be remembered are fast upon the shaft11 and thus move at a uniform speed. To prevent t-he disengagement ofthe pinion 8 by the fingers 34 moving with the ratchet wheel 29, thelower end of the arm 24C is normally spaced from the arm 24 as shown inFig. 7 As will be aresently more fully set forth, the arrangement issuch that in the initial portion of the movement of the fingers 10E1relative to their flanges 37, the pinion 8 is disengaged from the disk22. ln the final portion of such movement the indicator is permitted toreturn to its zero position (determined by the stop pin 26 and theshoulder 26b of the disk 22), under the action of the spring 25. Themeans for accomplishingr this latter result comprises a cam member 241on the lever 33, adapted to engage with a lug 24C upon the holding pawl221l for the disk 22.

It will be apparent from the foregoing that in the embodimentillustrated in Figs. 1 to 9, the disk 22 is operated through a directconnection with the drive shaft (5, and that the duration of thesuccessive operating periods of the disk is uniform, being under thecontrol of the fingers 10a rigid with the shaft 11 which rotates at aconstant speed. It will also be seen that while the operating periodsare of uniform length, the spring rewinding periods vary in lengthdepending upon the speed of the vehicle, but are always of the sameduration for given speeds of the vehicle. For example, with the presentarrangement, when the vehicle is traveling at a rate of sixty miles perhour, the rewinding period is equal to one-eighth of a second, and ifthe vehicle is traveling at a speed of thirty miles per hour, therewinding period is equal to one-fourth of a second. Because thisrewinding period is always the same at a given speed of the drive means,the operating mechanism may be proportioned and arranged, if so desired,so that the indicator means is actuated by the constantly driven shaft11 during' the rewinding periods, a reversal of the arrangement aboveset forth, as will hereinafter more fully appear in connection withFigs. 15 to 17.

Referring now to the operation of the device in the form shown in Figs.1 to 9, the ratchet wheel 29 of the s} )ringwinding mechanism isarranged to be rotated one revolution in sixteen seconds, and since twoactuating pawls 31 and 31 are employed, operating successively in cachrevolution of the drive shaft, thirty-two teeth are provided on theratchet wheel. Moreover, said pawls are moved into and ont of engagementwith the ratchet wheel once for each one-quarter of a revolution thereofor once in four seconc s. This four seconds period is in the presentinstance so divided up that during the first two seconds of each periodthe ratchet pinion 8 is in operative eng nent vidi the toothet diskUonseqnentiy, the indicator e is connecteV with the drive shaft forpositive movement the during the initial oneeighth portion oi: theperiod. it the end of this initial one-ei hth portion, the cam fingersl'-`- vJiLh the flanges on the levers 29h and i2-, so that at tiebeginningl of the succeeding or third second of the period the ratchetpinion 8 is disengaged from the disk 22. rlhe latter consequently comesto rest in its advanced position so that the indicator l remainsstationary for approximately one second or until one of the cam fingerslo in its final travel upon the .liange 37 of the lever operates sai llever and thereby the cam member 24'. to elect the disengagement of thepawl 22iL from the disk The final or fourth second of the period istherefore provided to ei'cct return of the indicating means to Zeroposition for speed correction purposes.

it will be remembered engagement of the fingers from the flanges 3,7,through the operation of the lingers 103, the actuating pawis arepermitted to re-engage the ratchet wheel to resume the operationtensioning the spring. At the same time the ratchet pinion 8 moved bythe operation of the spring 19a into the reengagement with the dish 22,and the holding pawl 22gl is also moved by the spring 31 intorfa-engagement with the toohcd disk The foregoing operation is thenrepeated dur- 'tiie next fom' seconds period.

at upon the disinfr t] .1 1 it will be noted that wnile f thus utilizethe cam iin l0 ofthe govcrnin vieans for controi ing` the connnection litween the indicating means and the dri shart, the

lingers operate int pendently of this last only function mentionedcontrol. T ius tl' is to mai-:e the spring' tensioning operations at allspeeds uniform. Tini-.s 'ring to l i0'. 7', ripon the disengagement ofthe fingers fronf the flanges 87, the actuating pawls immediately engagewith the ratchet wheel and continne to operate until the movement of.soci fingers is limited by the lugs 37, after having' traveled througha one-quarter turn (Fig. 2). Conseqnc tly same amornt of tension isplaced upon the spring during each four seconds period regardless of thespeed of operation of the vehicle; and as a result, the sgring is mintained under substant constant tension being maintained at tii atleast three-quarters strength.

Gbviously the gearing connection between the drive shaft and theindicator means is so all proportioned and coordinated with the scale onthe main dial that the dial properly registers the speed at which thevehicle is traveling. Herein the drive shaft 6 rotates at a .l of 1024irevolutions per mile of travel, seo-ment formed by the teeth on theratchet pinion so arranged gm, complete revolutions of the disk is movedthrough 180 degrees. e on the dial is accordingly arranged i miles inthis movement.

in the embodiment of the invention illustrated i i lligs. l() to ist, lhave shown in place of the indicating pointer 4a, a disk ta (Fig. lcoaciing 'with a stationary pointer 4l on a onary plate corresponding tothe dial r ihis requires the location of' the shaft 5 slightly below thecenter of the casing, an opening el) being provided in the front platesubstantially centrally thereof to expose the movable dial ein.

In this embodiment also I show an arrangement in which only oneactuating pawl 31a is employed, the pawl 29a constituting a holdinglpawl corresponding in function to the pawl 29P- in the first embodiment.Because of the use of one actuating pawl l arrange to drive .it at twicethe speed of the corresponding pawl 31l in 1 to 9. To this end I provideon the drive shaft G, a gear 18 meshing with a pinion 18L1 on astationary shaft 12. Said pinion 1da operates the gear 19 for rototingthe pinion 8., and the pawl 31a is mounted eccentrically on the pinion18a. ln other respects this mechanism is substantially similar to theembodiment above fully described.

Peferring now to Figs. to 17, I have in this instance shown theconstruction and arrangement of the parts which may be employed in theevent that it is desired to actuate the indicator during the rewindingperiods, which it will be remembered, vary in accordance with the speedof the vehicle but which nevertheless are always the same at givenspeeds. In this instance the winding` means on the control mechanism issubstantially the same as in the form above described, with theexception that the movement of the actuating pawl 31a through theoperation of the fingers 34E is utilized to control tl'ie connectionbetween the indicating means and the drive shaft, whereas in the case ofthe embodiment shown in Figs. 1 to 9, the controlligA means for thewinding mechanism con. Lols indicating means by periodicallydrsconnectine the same from the driving means.

rlie toothed disk 2./ has rigid therewith, in this ins .i nce, a gear 19which meshes with a pinion S carried by a depending arm 29c on the lever29. The pinion 8 is driven by power derived from the drive shaft 6 butthrough the spring 2G of the governor means. Thus the gear 18 rigid withthe shaft 11 of the winding mechanism, meshes with the pinion 8 so as todrive it constantly at a uniform speed. The arrangement is such that ata predetermined point in the movement of the fingers 34a into engagementwith the flange 37 on the lever 29h, the pinion 8 is disengaged from thegear 19.

A pawl 22a pivotally mounted upon a stationary shaft 12 is normallyspring pressed into engagement with the toothed element 22. The upperend of this pawl, however, has a cam portion 24" which is disposed inthe path of swinging movement of the lever 33 so that when the latter ismoved by the fingers 34a to carry the pawl 31 into inoperative position,the pawl 22a is actuated to release the element 22 for return to Zeroposition under the action of its spring 25. Normally, however, the cam24h is spaced from the lever 33 so that in the initial portion of themovement of the lever by the fingers 34a, the pawl 22a continues to holdthe disk against return movement, the pawl being operated only as thefingers 34a approach the end of their movement upon the flanges 37.

In this instance, the holding device of the escapement mechanism ispositioned above the toothed wheel 30EL thereof, which latter is fastupon the shaft 11 as before.

Referring to Fig. 17, the operating means for the indicator is soproportioned that onefourth of a revolution of the time shaft 11 andhence of the gear 18', will impart a threequarters revolution to thedial 4*. And since, when the vehicle is operating at high speed thefingers 34a willV travel through each onequarter revolution in a veryshort time, the movement imparted to the dial through the operation ofthe shaft 11 and gear 1S thereon will be relatively slight. Similarlywhen the vehicle is traveling at a loW speed, the time required for therewinding operation, that is to say, the time required for the movementof the fingers 34a through one-quarter of a revolution will berelatively great, so that a correspondingly greater movement will beimparted to the dial. Consequently, the scale on the latter isproportioned accordingly. In the present instance, the arrangement issuch that when the vehicle is operating at aspeed of one mile'per hour,the time required for the movement of the fingers 34a through onefourthof a revolution is fifteen seconds, and when the vehicle is operating ata speed of sixty miles per hour, the time required is onefourth of asecond. Thus it will be seen that in this embodiment of the invention,the indicating means is actuated by a driving means rotatlng at auniform speed, and under the control of a means actuated at a speedvarying with the speed of the vehicle.

t will be apparent that my invention is susceptible of various changeswhich may be made by those skilled in the art, so that it is to beunderstood that in the interpretation of t-he appended claims they arenot to be limited to the particular means herein illustrated anddescribed except as may be necessitated by the state of the prior art.The construction employed in the several embodiments shown is of anextremely simple character, so that the device may be manufactured at arelatively low cost. Economy in manufacture, however, is not obtained ata sacrifice of accuracy in registering the speed of a motor vehicle, orthe like, for it will be apparent that since the indicating means isdriven. through connection with the drive shaft, under the control of agoverning means which is capable of effectually regulating the periodsof operation of the indicating means, accurate results are insured.

I claim as my invention:

1. A speed registering device comprising, in combination, indicatingmeans, a drive element operating at a variable rate of speed, a shaft tobe driven at a uniform rate of speed, actuating means for said shaftincluding a coiled torsion spring, and a device arranged to be operatedperiodically by said drive element, means for controlling the operationof said actuating means, and means providing a connection between saiddriven shaft and said indicating means also governed by said controllingmeans.

2. A speed registering device comprising an element to be rotated at aconstant speed, driving means, means for rotating said element includinga ratchet wheel arranged to be rotated in one direction only by saiddriving means, means for preventing a rotation of said wheel in theopposite direction, a spring one end of which is connected to saidelement and the other end of which is connected to said rotary member,and a device for periodically rotating said ratchet wheel.

3. A speed registering device having;r a drive element, indicating meansarranged to be directly connected to said element for movement thereby,and mechanism for controlling such connection including an actuatingspring, means operating periodically adapted to energize said spring inthe rotation of said element including a rotary member having meanspermitting its rotation in one direction only, whereby to prevent anunwinding of the spring upon a reversal of the drive element, and meansfor stopping the shaft from actuation by said spring upon stoppage ofthe driving element.

4. A speedometer having an indicating means, an element rotated at avariable rate of speed, and means providing a. periodic connectionbetween said indicating means and said element including a governingmeans having an element to be rotated at a constant rate of speed, aspring for actuating said element, and means for periodically effectingthe tensioning of said spring and adapted to ope `ate automatically toprevent :i deenergizing` of Jdie sp "ing upon. ille sieppege or reversalof Jdie drive element.

5. A speed register-ing;I device havingy in Combination, indicating'means, an element rota-tei it varying rates of speed depending upon liespeed ol" the part to be ii'iessiired, a second elemene, ineens forreiniging; second element at a uniform speed including a spring` and enoieieive eonneeioii between said spring ai 'l the i'iist elemen adaptedio operaio intermiil'ently et infiervsls depending upon *die speed oi'lie llist olemeiiI io energize Seil spring.v ond ineens operating :itregular i1 ation of the second elemeni` "o e ,blisli en operative eonnecion be\veen said indieaing means and die iii-s element.

S. il. speed regisering deviee comprising, in Combination with anelement rotating at a variable rete o speed, indicating meansj meansproviding an operative Conneet on tween said indiest'iig ineens and seideleinen;

including' a spr'ng-)Lii'essed iiteiviils in tlie o ber, and means forControllii'igg sail eo'inection including s slimev rotatable lint rateof speed and o. lever (l periodically operated in the i simil; andadapted io move seid inoperative posieioii against Jalie spring'.

7.7. A. speed register iiziion i Ward and from said segment, s sligYseid merid t (32MB Bielli el iend mean, controlling` lle eo veen seidCaving means en( y 've elemerr incl i :i lever arranged o be zieiiziedby stair l membei1 and slei ted re mov i l Wheel rele'eive to seid.segmeii 8. A iegiseiing deviee lisvin be driv ,n :i constar raie olisivangr one end eoiinee lie other end olf' die spi-ing eomieeed l er ereeiproeaoiy pawl edepied ratchet xvlieel wiiereby to energia-ze ineenson seid sliii'it operable o oon-L tlie position of seid pzuvl Wlierebyto f. if'

the periodic energizeion el 9, A sgeed registering devi tf be olives ets Censis-nt i y e sping having one end connected .vili jalle slieftretelie vvlieel loose on sli/rif and olie oilier end of the sp i i fl lreeipre-oetory pevvl l Y i e ssi;L rnvhliet vvlieel Wbeieby io ener-glieseid sbr'x neens on slizil't operable to control osition oiivsaid Qmvlwhereby to effect lie energize-tion of Jilie spring e piny" w l l Y e iso osso spring to energize i, and means ier eo iii i o "y criniiirisingC. plui'zi i' i opere ile in eeen revolu' or ilie snsltto elfee+V vlieoperation or' i plurality oi' times.

r' v' A' L n. v I speed. iegisieiing device iiven o. snbssl elenieiil;`to be i l L ,l nd means i'or ment including` s spring having neeteddiei-elo, o i i'olsizil to Said element beil during ezieli l2. A speed ielemen l'o be stent epee l ind i mentiiielneing i iieeed ilierel'i, v erelaiive 90 so seid element and lisvi'ig the other end of L i ll meansfor die spring Connecter 'tl'ierelm :l n" n Y i o i etnie l i; Qerio Jei ioveinen't sai-l niemli revolution o sind element e miolling devisesnd eqnidistsnly bei during eee includingl o, plureliiv of ino "ablevrili soie eiemen zi spaced lieiezibou 13. i speed elemenI io be 5 in,ii/sns drivin;v bert inellv i sping, a sliai'i connected Witli elle parimios .il is be 'blotelinneo ,1 and rotaie@ a deviee for Vensioin said Avice being zieuoceil by solo slizif" and oseraitlng solely under tl L lon vii rio of' seid element for periods of varying duri depen l' uponelle speeo oi? JClie slime.

lll. i speed device element io be driven et e snbss stent sneed, ineensfor @einer if; su' 110 including z. spring lie ying oi end e e memberloose on 1 elf;

l Y f tliereo, 'l having lne olliei oi tlie spring eonnoried lliereo7 eperf; Y LiioiL seid element so is io be rotazible ierewitli, s seeond falso moved by tlie rst part, i said member in one oireeiion spring, saidmeans being` adopted to be trolled by Jlie operation oi" srilc )erts tonieve out of and into engagement with seid ber, and means for holdingseid member Y I rotation in the opposite direction.

n o. iegisei'ing device., :i part to be 125 driven having an actuatingspring, means for energizing seid springincluding i reeiyroearoiy "owl,and ineens for controlling 'blie operation or seid pziwl including a cammember operable With sind part, and a stationary member operable by saidcam member to render the pawl inetlective.

16. The combination of a drive member', a pair of relatively rotatableelements mounted concentrically at one side of said drive member, aspring connecting said elements, a device connected with said drivingmember for reciprocation thereby and operable to rotate one of saidelements whereby to place said spring under tension so as to rotate theother one of said elements, and means operable when said device ceasesto reciprocate to stop substantially simultaneously the movement of saidother element by said spring.

17. A speed regulating device for motor vehicles and the likecomprising, in combination, driving means, indicating means, meansproviding an operative connection between the indicating means and thedriving means, a pair of relatively rotatable elements concentricallyarranged, a spring connecting said elements, means providing anoperative connection between said drive means and one of said elementswhereby to rotate it intermittently and tension said spring, means forholding said rotated element against reverse rotation, means operable inthe rotation of said other element to disconnect the indicating meansfrom the driving means, and means operable when the driving means comesto rest to render the spring ineffective to move said other element.

18. A speed registering device having an element rotated at varyingrates of speed, and a control device operatively associated with saidelement and including an element to be driven at substantially constantspeed, a spring drive for said element, and a device for energizing saidspring drive controlled solely from the second mentioned element andoperating at spaced intervals of a length determined by the speed of therst element.

19. A Speed registering device having an element to be driven, means fordriving said element including a spring, a shaft connected with the partwhose speed is to be determined and rotatable at a variable rate ofspeed, and means actuated by said shaft and controlled solely by saidelement so as to operate for periods of predetermined duration dependingupon the speed of the shaft whereby to energize said spring.

20. A speed registering device having an element to be driven at asubstantially (onstant speed, means for driving said element including aspring, a shaft connected with the part whose speed is to be determinedand rotatable at a variable rate of speed, means constantly actuated bysaid shaft, and cam means actuated solely by said element forcontrolling the winding of said spring by said constantly actuatedmeans.

21. A speed registering device comprising, in combination, a driveelement having a ratchet pinion continuously driven thereby and mountedfor swinging movement, indicating means including a toothed memberadapted for engagement by said pinion, means tending to hold said pinionin driving connection with said member, means tending to move saidmember into initial position, a pawl normally engaging with said memberto hold it in its advanced position, and governing means operable todisengage said pinion and pawl from said member, said governing meansincluding a lever, cam means operable periodically to swing the lever,and means car- -n by the lever for independently moving said pinion andsaid pawl.

22. A speed registering device comprising, in combination, a shaftoperating at a variable rate of speed, an clement to be driven at asubstantially constant speed, indicating means having a disengageableconnection with said shaft for movement thereby, means including aspring arranged to be energized in the operation of said shaft to causesaid element to rotate at a substantially cont speed, and cam meansoperating in the rotation ot said element to control such cennectionbetween said shaft and the indicating means and also to govern theenergien of said spring.

A speed registering device comprising, in combination, driving means,indicating means, and a governing means for controlling e operation ofthe indicating means through power derived from the governing means,said governing means including a part to be driven at a substantiallyconstant speed, 2 vans including a spring for rotating said part, meansoperating intermittently for periods determined by the speed of thedrivii g" means whereby to maintain the spring under tension, and meanscontrolled by said governing means providing an intermittent connectionbetween said indicating means and sain shaft.

24. A speed registering device comprising, n combination, a driveelement, indicating means arranged to be periodically connected vithsaid drive element for movement therey, a pawl arranged to be constantlyreciplocated in the operation of the drive element, ratchet wheelarranged to be actuated by said pawl, a spring having one end connectedwith said ratchet wheel, a shaft upon which said ratchet wheel ismounted and having the other end of the spring connected thereto, afinger rigid wit" said shaft and a lever movable by said linger adaptedto control the movement of said pawl relative to said ratchet wheel.

ln a speed registering device the combin on of a drive element, a pawlarranged to be continuously reciprocated by said element. ratchet wheelarranged to be actuated by id pawl, a spring adapted to be tensioned inthe operation of said ratchet wheel, a part with which said spring isconnected and arvcd/i ranged to be operated thereby, a cam memberactuated in the movement of said ratchet wheel, and a lever operable bysaid cam member to control the movement of said pawl relative to saidratchet wheel.

26. A registering device comprising, in combination, a drive element, apawl reciprocated in the operation of said element, a ratchet wheeladapted to be actuated by said pawl, shaft npon which said ratchet wheelis mounted, a spring connecting said ratchet wheel and shaft, cam meansoperable in the movement of the ratchet wheel whereby to move said pawlout of a normal operative engagement with the ratchet wheel, and cammeans movable in the rotation of said shaft whereby to effect themovement of the pawl into engagement with the ratchet wheel.

speed registering device comprising, in combination, a drive element, apawl reciproeable in the operation of said element, a ratchet wheeladapted to be actuated by said pawl, a shaft upon which said ratchetwheel is mounted, a spring connecting said ratchet wheel and shaft, cammeans operable in the movement of the ratchet wheel whereby to move saidpawl out of a normal operative engagement 'with the ratchet wheel, andcam means movable in the rotation of said shaft whereby to effect themovement of the pawl into engagement with the ratchet wheel, said twocam means being adapted to interlock upon a stoppage of the driveelement.

28. speed registering device having, in combination, a drive element,indicating means including a rotary member, a member continuouslyconnected 4with the drive element, and means for effecting periodicallythe kconnection and disconnection of said members comprising a shaft tobe driven at a substantially constant speed, an actuating memberoperatively connected with the drive element, cam means for controllingthe operation of said actuating member, and means operable said cammeans to control the lconnection between said driving and drivenmembers.

29. The combination of two relatively rotatable elements, a helicallycoiled spring connecting said elements, and means acting at regularintervals to impart successive rotary movements of exactly the samelength to one of said elements whereby ,to actuate the other elementthrough the medium of said spring, said successive movements being lessthan a complete revolution.

30. The combination of an element to be driven continuously at a uniformrate of speed, of actuating means therefor, and means -operatingintermittently to impart to said actuating means .successive powerimpulses eaeli of a definite predetermined value 2111.101 each effectingthe movement of said actuating means through less than completerevolution.

31. The combination with an element to be driven continuously at asubstantially uniform speed, of actuating means therefor including aratchet wheel and a reciprocatory pawl, and means operating to effectthe periodic engagement of said pawl with said ratchet wheel whereby toimpart to said actuating means successive power impulses each of adefinite predetermined value.

32. The combination with a drive element and an element to be driven, ofactuating means for the driven element including a ratchet wheel, a pawloperatively connected with said drive element for constant reciprocationthereby, means for effecting the periodic engagement of said pawl withthe ratchet wheel whereby to impart successive power impulses to theactuating means each of a predetermined value, and means for preventingthe reverse rotation of said ratchet wheel.

33. The combination of two relatively rotatable elements, a. springconnecting said elements, and intermittently operating means forimparting a plurality of power impulses to one of said elements duringeach revolution thereof.

34. The combination of two relatively rotatable elements one of which isaratchet wheel, a. spring connecting said elements, actuating means forrotating thel ratchet element in one direction to place said springunder tension, means independent of the actuating means for holding saidratchet wheel against rotation in the opposite direction, and meansoperable to interrupt the rotation of the other one of said elements bysaid spring when the actuating means comes to rest.

35. The combination of two relatively rotatable elements concentricallyarranged, a spring connecting said elements, a drive element located atone side of said rotatable elements, and means including apawleccentrically connected to said drive element so as to reciprocateconstantly, said means being adapted to impart successive rotarymovements of equal length to one of said elements whereby to actuate theother element through the medium of said spring.

86. The combination of two relatively rotatable elements, a springconnecting said elements, a drive member, means connected with saiddrive member and adapted to rotate one of said rotatable elements in onedirection whereby to tension the spring, means independent of the drivemember for holding the last mentioned element against rotation in the.opposite direction, and means operating in the movement o-,f the otherone of said elements by said spring, to interrupt the unwinding thereofupon a stoppage of the drive member.

37. A speed regula-ting device comprising, in combination, drivingmeans, indicating means, and a governing means for controlling theoperation ot the indicating means through power derived from the drivingmeans, said governing means comprising a shaft, a rotary memberoperatively connected with the driving means, a spring connecting saidmember and said shaft, a device actuated solely by said shaft foreffecting the intermittent operation ot said member, and an escapementmechanism including a toothed wheel fast on said shaft.

38. The combination of two relatively rotatable elements, a springconnecting the elements, actuating means including a member having apivotal mounting at one side of said elements independently thereof,means operable in the movement of said member to impart successiverotary movements to one or said elements, means operable in the rotationof one of said elements to effect the movement of said actuating' memberinto an inoperative position, and means operable in the rotation of theother one of said elements to effect the movement of said actuatingmember into operative position.

39. A speed registering device comprising, in combination, drivingmeans, indicating means and a governing means for controlling theoperation ot the indicating means through power derived from the drivingmeans, said governing means comprising a shaft, a rotary memberoperatively connected with the driving means, a spring connecting saidmember and said shaft, means for effecting the intermittent operation ofsaid member for periods of predetermined duration depending upon thespeed ot the vehicle, and means operating under the control of the lastmentioned means providing an intermittent connection between saidindicating means and said driving means.

#10. The combination of two relatively rotatable elements, a springconnecting said elements, a drive shaft located to one side of saidelements, and means Vfor successively rotatingouevot' said elementsincluding a pair of reciprocatory members eccentrically mounted on thedrive sha't't so as to be reciprocable in the rotation thereof, and aratcliet wheel rigid with one of said elements and adapted to be engagedupon diametrically opposite sides by the respective actuating members.

4]. The combination ot two relatively rotatable elements, a springconnecting said elements, means adapted to impartrotary movements to oneof said elements including an actuating member, and means forcontrolling the actuating member including a pair of cam fingers movablewith respect to said two elements and being capable of a limitedmovement relative to each other.

42. The combination of two relatively rotatable elements, driving means,a spring connecting said elements, means actuated by the driving meansadapt-ed to drive one of said elements in one direction whereby torotate the other element through the spring, means for preventing areverse rotation of the first or driven element, and means adapted tointerrupt the movement of said other element by the spring upon thecessation ot movement ot the drive means.

43. The combination of two relatively rotatable elements, a springconnecting said elements, and intermittently operating means tor movingone of the elements to place said s ring under tension, said meanscomprising two separate cam means respectively movable with the twoelements and adapted to limit each operation of said intermittentlyoperating means to less than a complete revolution ort the elementrotating thereby.

44. A speed registering device having, in combination, two relativelyrotatable elements, a spring connecting said elements, mea-ns forrotating one ot the elements to place said spring under tension, andgoverning means including a pair of coacting parts one otwhich has alost-motion connection with the rotated element and the other aconnection with the spring-actuated element.

45. T ie combination of two relatively rotatable elements, a springconnecting said elements, and an intermittently operating means to moveone of the elements to place said spring under tension, said meansincluding a continuously operating actuating member, and two separatecam means for controlling said actuating member, said cam means having alimited relative movement with respect to each other whereby to preventan unwinding of the spring when said actuating member comes to rest.

4G. The combination of two relatively rotatable elements, a springconnecting said elements, intermittently operating means for moving oneot the elements to place said spring under tension including a pawl andratchet mechanism, means for periodically rendering said mechanismineffective, and means for preventing an unwinding of the spring whenthe pawl and ratchet mechanism ceases to operate, said means beingindependent of the connection of said actuating means with a source ofpower.

47. The combination of two relatively rotatable elements, a springconnecting said elements, intermittently operating means for moving oneof the elements to place said spring under .tension including a driveelement, an actuating member continuously operated by said driveelement, and means operable when said actuating member is eitherassociated or disassociated from the element driven thereby, to preventthe unwinding of the spring upon the stoppage of the drive element.

48. A speed registering device having, in

combination, indicating means including a rotary member having a springfor moving it in one direction, a device for holding it against reverserotation, driving means having a member adapted for operative engagementwith said rotary member, a pair of relatively rotatable elements havinga spring connection, means operable by the driving means to tension saidspring, and a single means for controlling the connection between saiddriving member and said rotary member and for releasing said holdingdevice.

49. A speed registering device having, in combination, indicating meansincluding a rotary member having a spring for moving it in onedirection, a device for holding it against reverse rotation, drivingmeans having a member adapted for operative engagement with said rotarymember, a pair of relatively rotatable elements having a springconnection, means operable by the driving means to tension said spring,and a single means for controlling the connection between said drivingmember and said rotary element, for releasing said holding device andfor controlling the spring tensioning means.

50. In a speed registering device, the com` bination of an indicator, avariable speed drive element, a constant speed governing element havingcontrol means operating in the rotation of the element to eiiect theperiodic connection and disconnection of the indicator with the variablespeed element, said constant speed element including an actuatingspring, and means driven from said variable speed element to tensionsaid spring, the spring tensioning means being also renderedperiodically effective by said control means.

In testimony whereof, I have hereunto aiixed my signature.

CHARLOTTE ARNESEN.

CERTIFICATE OF CORRECTION.

Patent No 1,737,400. Granted November 26, 1929, to

CHARLOTTE ARNESEN.

ItI is hereby certified that error appears in the printed speeiiieationoi the above numbered patent requiring correction as follows: Page 6,line 105, claim 2, strike out the Words "rotary member" and insert"ratchet wheel to drive the latter, and means operating upon a stoppageoi the driving means for stopping said element against continuedmovement by said spring'"; same page, line 111, claim 3, after the word"including" insert the words "a shaft having"; and that the said LettersPatent should be read with these corrections therein that the same mayconform to the record of the case in the Patent Office.

Signed and sealed this 14th day of January, A. D. 1930.

M. J. Moore, (Seal) Acting Commissioner of Patents.

CERTIFICATE 0F CORRECTION.

Patent No. 1,737,400. Granted November 26, 1929, to

CHARLOTTE ARNESEN.

lt' is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 6,line 105, claim 2, strike out the Words "rotary member" and insert"ratchet Wheel to drive the latter, and means operating upon a stoppageof the driving means for stopping said element againstcontnued movementby said spring"; same page, line lll, claim 3, after the Word"including" insert the words "a shaft having"; and that the said LettersPatent should be read with these corrections therein that the same mayconform to' the record of the case in the Patent Office.

Signed and sealed this 14th day of January, A. D. i930.

M. J. Moore, (Seal) Acting Commissioner of Patents.

